Function.prototype.a = () => console.log(1)
Object.prototype.b = () => console.log(2)
function A() { }
var a = new A()
// a.a()
a.b()
console.log(a instanceof A);
console.log(a instanceof Function);
console.log(a instanceof Object);

var name = '123'
function a() {
    var name = 'abc'

    b()
}
function b() {
    console.log(name)
}
a()

let arr = [1, 2, 3, 4, 5, 6, 7, 8]
